Doing full-body strength training three times a week for three months helps older adults, even those over 85, gain about 2% more muscle — and it works just as well for the very elderly as it does for the 'younger' elderly.

Doing full-body strength training three times a week for three months can boost thigh muscle size by about 10–11% in older adults, even for those over 85 — showing that very old age doesn’t stop muscles from growing with exercise.

If older guys who are already active do full-body strength training three times a week for three months, they’ll get stronger legs and bigger leg muscles—even without adding extra protein to their diet.

Working out with weights twice a week for four months can help middle-aged Japanese women build a little more muscle, even as they get older.

Even people in their 50s and 70s can get much stronger and activate their muscles better after 12 weeks of heavy weight training — age doesn’t stop them from improving.

When older women lift weights for 8 weeks, their muscles don’t get much bigger, but they do get stronger and walk faster—so it seems like something other than bigger muscles is helping them move better.